Tubing adapter



FIG. 1 is a top perspective view of a tubing adapter showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is front side view thereof;

FIG. 4 is a rear side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 it a top view thereof; and,

FIG. 8 is a bottom view thereof. 

CLAIM The ornamental design for a tubing adapter, as shown and described. 